<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        /* let声明的变量虽然挂载window上了,但是是空值 */
        let name = "webgis";
        function fun() {
            console.log(this.name);
        }
        fun()
        console.log(this);
    </script>
</body>

</html>